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oNPDNT <br />Du PONT ENVIRONMENTAL REME(7It\TION SERVICES <br />7068 Koll Center Parkway, Suite 401 <br />Pleasanton, CA 94566 <br />(415) 462-7772 <br />Fax: (4151 462-7944 August 15, 1990 <br />Job No. 1088-114 <br />Conoco Inc. <br />600 North Dairy Ashford <br />TR 3056 <br />Houston, Texas 77079 <br />ATTENTION: Mr. Gregory P. Fletcher <br />Coordinator - Environmental Affairs RECEIVED <br />SUBJECT: Monthly Status Report - July 1990 AUG N 0 !T'J <br />Former Econo Gas Station <br />4325 East Washington Street ENVIRONMENTAL <br />Stockton, California AFFAIRS <br />Dear Mr. Fletcher: <br />This is a monthly status report for the soil remediation system at the above-refereac 6 site, for the <br />month of July 1990. <br />A Du Pont Environmental Remediation Services' technician visited the site on a weekly basis. Typical <br />activities that were performed during the visit included equipment inspection, instrument calibration, <br />influent and effluent concentration measurements, and control system adjustments. A hand-held <br />organic vapor analyzer (OVA) was used by field technicians to measure hydrocarbon concentrations <br />and one tedlar air bag sample was collected for laboratory analysis. <br />Based on operating parameters listed on Table A, approximately 1,925 pounds (312 gallons) of gasoline <br />have been extracted during this reporting period. The remediation system has been operating since <br />August 1989, and since then, approximately 14,447 pounds (2,345 gallons) of gasoline have been <br />extracted and properly treated. Attached are two figures which show Gasoline Extracted Per Month <br />(Figure 1) and Cumulative Gasoline Extracted (Figure 2). <br />Respectfully submitted, <br />DU PONT ENVIRONMENTAL REMEDIATION SERVICES <br />1 <br />Vivek M. Kini Robert A. Katin, PE, REA <br />Staff Engineer Engineering Manager <br />VMK/RAK:cb <br />Attachments: Table A - Operating Parameters <br />"Ci re 1 - Gasoline Extracted Per Month <br />a" <br />Figure 2 - Cumulative Gasoline Extracted <br />Better Things For Better Living <br />